thomas



e. e. THOMAS( Hot-Air Furnace. y

4e shame-sheet s.

` No. 105,864.` l Patented July 26, 1870.

M PETERS, PHOTO-LITHOGRAPHER, WAsmNGToN, D C.

@anni @mira GEORGrlil Gr. THOMAS, OF ST. LOUIS, MISSOURI.

Laim man No. 105,864, daaa'Juzy 26, 1870.

' HOT-AIR FURNACE.

The Schedule referred to in'these Letters Patent and making part of the sai-uae To all whom, tnmai/ concern:

Be it knownthat I, GEORGE G.THoMAs, of St.

Louis, in tlie county of St." Louis and State of Missouri, haveinvented a new and useful Improvement .in Furnace ;v and I do hereby declare that the following isa full and exactdescription of the same, reference being had to the accompanying drawing and to the letters of'reference marked thereon. A v

This invention has for its main object the production of affurnace which shall be durable in all its parts, and yet be comparatively inexpensiveto manufacture',

and consists incertain details of construction, -which will be fully described hereinafter.v In the drawing- Figure l, vsheet 1, represents a central vertical sec- `tion across the furnace from side to side,l,

Figure2 represents a perspective view of the gra'te -Eigure 1, sheet 2, represents a central vertical section across the furnace ti'om .front to rear.

Figure 2, shee t 3, represents a plan view through the line 'a x, iig, l; and` Figure 3, sheet 3, aplau view through the line yy, fig. 1, sheet 1.

To enable others skilled in the art to make and use my invention, I will now proceed to describe fully its construction and manner of operation. f A represents the re-pot, constructed,preferably, at fire-brick, which is imbedded iu the solid brick walls a a, and completely iuclosed thereby, as shown. i lt is providedwithiiaring sides, and'opens below into the ash-pit B, in the usual manner.

C represents the grate, constructed-'of bars, c c, united in, any suitable manner., The form of these i hars is peculiar. Their upper 'sides are sharply iuclined, and provided with grooves or depressions wider at the bottom than at the top, as is clearly shown in iig. 2, sheet 4.1.

The location of the grate is also peculiar, It is dropped several inches below the upper line of thc 'ashpit, and is left open in front. By means of this construction, the removal of any clinkers which may form' thereon is easily eiiected by the use of a poker, with.- out turning the grate. v

D represents the coalfreservoir, which is located immediately overthe hre-pot.

1t is preferably constructed of wrought iron, `with anges, d, which rest upon the edges of a layer of lire- -brick interposed between them and the lire-pot. A few courses of re-brick may alsoy be. placed above the lianges, il' desired, for the purpose ot' protecting the outside. of the reservoir from excessive heat.

This reservoir is so arranged over the tire-pot as to leave an opening, d, on each side and at the rear end,

through which the products' of combustion from the WOM-gyire-pot ,are permitted to pas's upward through .the radiator to the smoke-tube.

Goal is supplied to this reservoir through the opening d2 in the radiator, and the opening d, in the outer casing.

'E represents a reservoir for water formed in the walls a a, which rentirely surrounds the lire-pot near its upper edge. v

It is provided with a covering of tire-brick, which projects slightly over the edge of the fire-pot, and forms the flue or passage e at the top edge ot'. the lire-pot,

between the re-pot and the {ire-brick, sulliciently large to supply oxygen for .burning the gases,` and smoke of the coal.

This chamber is provided with au opening iu the front of the brick-work, through which the air and water may bentroduced.

The due E ot' this chamber, it will be observed', is arranged in such relation to the opening d that the air or vapor caused to rise through the former by the l heat of the fire-pot, is brought into direct contact with `thergas and smoke arising through the latter from the fire-pot. The union ofthe oxygen of the air or water from the one with the products of combustion of the other, causes the latter to be entirely consumed.

F represents a perforated base-plate, which is bolted 'to the brick-work in any suitable manner.

It is preferably constructed of cast-iron, aud is provided with vlianges, ff', for the purpose of supporting the radiator and outer casing. Its outer edge is provided with a down wardly-proj ecting fiauge,which covers the edge of. the brick-work, and protects it i'om being accidentally broken in any manner. Through the perforations in this plate the cold air passes from the chambers in the brick-work below to the heating-chamber above.

G represents the draught-tube, the lower end of which communicates with an opening in the front of the brick-wood, covered by asuitable register, and the upper end of which opens into the door-frame of-the coal-reservoir D, as shown.

Behind this saine register in `the brick-work, but separated from the chamber opening into the draughttube G by a partition, is located a chamber which conneet-s with the ash-pit by means of holes in the top ol" the latter. l

By means ofi-this construction thc draught through the tube G and ash-pit B is regulated by a single movement of the register, the draught in the former serving tofdrive'down-'the gases froui'the 'cokiug coal in the f reservoir, andiu the latter serving to increase the Vwith an opening, d2, through which the coal is poured into the reservoir D.

I represents the upper portion of the radiator, which rests upon the cylinder H.

It is provided with connect-ing fines i t, drum iV, chamber t2, and smoke-pipe i3.

J represent-s the outer casing, which rests upon the flange f'.

It forms the hot-air chamber, and is provided with the usual pipes, jj, for conveying the hot air to any desired point.

The operation of the furnace is as follows:

The tire is first lighted and coal supplied through the door d3 of the reservoir. When well under way, thezreservoir may bc filled and the door closed. As the coal burns away at the bottom its place is supplied from the reservoir above. The clinliers are easily. drawn ont at the front by means of a poker, and the ashes are thrown down by slightly shaking the grate, the peculiar construction of the latter effectnally preventing their permanent lodgment.

'The products of combustion, with thc gases from the coking coal in reservoir I), which are forced down by the draught from tube G, bot-h pass from the tire-pot through the opening d1, up through the radiator H I, into tbe Striche-pipe.

At the opening dl they come in contact with the air or vapor from the chamber E, the oxygen in which, being highly heated, from its contact` with the fire-pot,

lburns freely, and consumes the heavier products of combustion, about topass away in smoke. By this result a much -niore intense heat is obtained, and the escape of smoke is effectnally prevented.

The cold air enters the chambers a. a' in the brickwork, passes-np through the perforated plate into the hot-air chamber, about the radiator', and is finally conveyed to the register by the pipe j j.

In consequence of the tire-pot and ash-pit being imbedded in the brick-work, and completely inclosed thereby, it is impossible for the heat to radiate into the cold-air chamber, as is the case in the ordinary furnace. This result has been found exceedingly pernicious in practice, inasmuch as the gases from the burning fuel, under certainV conditions, pass freely through the red-hot iron into theL` air-siiamber, au render it unfit for use. i

By means of my improved construction this difficulty is obviated, inasmuch as it is impossible for the cold air to come in Contact with the red-hot iron, or to receive gases from it in any way, or to receive ashes from the ash-pit.

This furnace is especially designed for soft coal, but may be used for other kind if desired.

Having thns fully described my invention,

What I claim as new, and desire to secure by Let ters Patent, is

1. The arrangement of the tire-pot A, ash-pit B, constructed as described, and walls a a, as described, for the purpose set forth.

2. Thewwater-reservoir E, arranged around the firepot, below the ue e and above the line of the gratebars, as described.

3. The air-passage or flue e, when arranged in relation to the opening d1, as described.

4. The perforated base-plate F, constructed as described, for the purpose set forth.

5. The arrangement of the draught-tube G, with its lower end opening into the outer air, and its upper end into the reservoir D, for the purpose of expelling the gases from the latter, as described.

6. The radiator described, consisting ofthe parts H I, connecting fines 'i i, drum t, chamber` t2, and smokepipe t, as described, for the purpose setforth.

7. The arrangementof the grate below the upper line of the ash-pit, as described.

8. The furnace described, consisting essentially of the h`re-pot A, ash-pit B, grate G, reservoir D, chamber E,plate F, draught-tube G, radiator H' I, and casing J, when combined and arranged as described.

This specification signed and witnessed this 23dday 1 of June, 1870.

GEO. G. THOMAS.

Witnesses:

EDM. F. BROWN, l H. W. BEADLE. 

